1 /* 2 * Copyright (C) 2023 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.adservices.data.adselection; 18 19 import androidx.room.Database; 20 import androidx.room.RoomDatabase; 21 import androidx.room.TypeConverters; 22 23 import com.android.adservices.data.common.FledgeRoomConverters; 24 import com.android.adservices.service.common.compat.FileCompatUtils; 25 import com.android.adservices.shared.common.ApplicationContextSingleton; 26 27 /** Room based database for Ad Selection Debug Reporting. */ 28 @Database( 29 entities = {DBAdSelectionDebugReport.class}, 30 version = AdSelectionDebugReportingDatabase.DATABASE_VERSION) 31 @TypeConverters({FledgeRoomConverters.class}) 32 public abstract class AdSelectionDebugReportingDatabase extends RoomDatabase { 33 private static final Object SINGLETON_LOCK = new Object(); 34 35 public static final int DATABASE_VERSION = 1; 36 37 public static final String DATABASE_NAME = 38 FileCompatUtils.getAdservicesFilename("adselection_debug_reporting.db"); 39 40 private static volatile AdSelectionDebugReportingDatabase sSingleton = null; 41 42 /** Returns an instance of the AdSelectionDatabase given a context. */ getInstance()43 public static AdSelectionDebugReportingDatabase getInstance() { 44 // Initialization pattern recommended on page 334 of "Effective Java" 3rd edition 45 AdSelectionDebugReportingDatabase singleReadResult = sSingleton; 46 if (singleReadResult != null) { 47 return singleReadResult; 48 } 49 synchronized (SINGLETON_LOCK) { 50 if (sSingleton == null) { 51 sSingleton = 52 FileCompatUtils.roomDatabaseBuilderHelper( 53 ApplicationContextSingleton.get(), 54 AdSelectionDebugReportingDatabase.class, 55 DATABASE_NAME) 56 .fallbackToDestructiveMigration() 57 .build(); 58 } 59 return sSingleton; 60 } 61 } 62 63 /** 64 * @return a Dao to access entities in AdSelection database. 65 */ getAdSelectionDebugReportDao()66 public abstract AdSelectionDebugReportDao getAdSelectionDebugReportDao(); 67 } 68